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The Associated Press reports that state lawmakers made the change last year in reaction to a November 2016 school bus crash in Chattanooga that killed six elementary school children and injured others. The driver, Johnthony Walker, was 24 at the time.

Authorities say Walker was speeding and had received a cellphone call before he wrecked the bus, which was carrying 37 children. Walker, now 25, faces 34 charges, including six counts of vehicular homicide.

The law also requires a school bus driver safety program, five consecutive years of driving experience for drivers and appointment of school district and charter school transportation supervisors.